Eh, I don't think EVERYONE is struggling with this. I am an introvert, and have no desire to go out and do more things with friends. I get enough socialization with my wife and kids, and don't really have the desire to do more things.
I'd use this as an opportunity to do something exciting with your life (if finances permit). Go live in Asia and do the nomad thing, if you're lonely there are a ton of Filipinas who want nothing more than to be a good wife and provide for their family. Try to start a business, take up some kind of art and make an honest effort to get GOOD at it, etc.
So you aren't one of the people that are lonely, because you have wife and kids
Though, I’m also single, so, maybe I wouldn’t feel such a need if I were married? Idk.